Trilobita
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"Trilobita." A Dictionary of Zoology. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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trilobite
trilobite (trī´ləbīt´), subphylum of the phylum Arthropoda that includes a large group of extinct marine animals that were abundant in the Paleozoic era. They represent more than half of the known fossils from the Cambrian period. The trilobite body was generally oval and flat and was divided into three roughly equal sections: the head, thorax, and tail. The name trilobite refers to a pair of furrows along the length of the animal that divided the body into three longitudinal regions. The body was covered by a mineralized shell. Because the dorsal, or upper, shell was thicker than the under shell, it has been the part best preserved in fossil form. Trilobites were abundant inhabitants of the Cambrian and Ordovician geological periods. They declined thereafter, possibly because they became food for cephalopods and later for fish, and became extinct in the Permian period. Trilobites are most closely related to the chelicerates, which include the horseshoe crabs and spiders.
See R. Fortey, Trilobite! Eyewitness to Evolution (2000).
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"trilobite." A Dictionary of Biology. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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"trilobite." World Encyclopedia. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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trilobite
tri·lo·bite / ˈtrīləˌbīt/ • n. an extinct marine arthropod (subphylum Trilobita) that occurred abundantly during the Paleozoic era, with a carapace over the forepart, and a segmented hindpart divided longitudinally into three lobes.
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"trilobite." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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"trilobite." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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"trilobite." A Dictionary of Zoology. . Encyclopedia.com. 21 Apr. 2018 <http://www.encyclopedia.com>.
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